| From | Arnd Bergmann <> | Subject | Re: [PATCH tip/core/rcu 0/21] v6 add lockdep-based diagnostics to rcu_dereference() | Date | Tue, 23 Feb 2010 13:59:07 +0100 |
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On Tuesday 23 February 2010, Paul E. McKenney wrote: > This patch series adds lockdep-based checking to the rcu_dereference() > primitive in order to flag misuses of RCU.
While I haven't looked much at this series, I've been thinking about adding static diagnostics for rcu_dereference misuse, in the form of an __rcu address space qualifier for pointers. Such a patch would obviously conflict with this series, so I'd wait for yours to go in first, but maybe you like the idea enough to do it yourself ;-).
The observation is that all accesses to an RCU protected pointer are either through rcu_dereference, rcu_assign_pointer or one of their variants. so it should be possible to add a new address space like we have for __iomem, __user and soon __percpu and have sparse check that we use RCU consistently on pointers that need it.
Arnd
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